An electric current flowing through a conductor creates a magnetic field around the conductor. The strength of the magnetic field depends on the strength of the current. This magnetic field can exert mechanical forces on nearby metals and electrons in conductors. The behavior of magnetic fields is important for understanding radio theory.

1. 2. MAGNETIC EFFECT: Every conductor through which an
electric current is flowing is surrounded by an invisible energy
known as the magnetic field. Moving electrons create this field
and the strength of the field depends upon the strength of the
current. A magnetic field is capable of applying mechanical forces
on metals and on electrons moving in nearby conductors. This
fact is important to remember in any study of radio theory.

2. 2. MAGNETIC EFFECT: Every conductor through which an
electric current is flowing is surrounded by an invisible energy
known as the magnetic field. Moving electrons create this field
and the strength of the field depends upon the strength of the
current. A magnetic field is capable of applying mechanical forces
on metals and on electrons moving in nearby conductors. This
fact is important to remember in any study of radio theory.

3. Magnetic
•! A magnetic field is produced in a straight conductor,
when current flows.
•! If the conductor is made into a coil an electromagnetic is
formed.
•! By controlling the current we can control the direction
and strength of the magnetic field.
•! Lets talk about:
–! scrap metal handling
–! solenoids
–! motors
–! power station, alternator field winding

4. Coils
armatur contacts
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coil
12V DC coil

5. Laminated steel core of a
transformer.